Inductive Anchorage Sensing for Fall Protection Under Magnetic Interference
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Solution Overview
Problem
Existing fall protection equipment lacks reliable and efficient methods to confirm proper attachment to support structures, particularly when covered or in the presence of external magnetic fields, which can lead to incorrect anchoring detection.
Innovation Solution
Incorporation of inductive sensors within fall protection devices to detect changes in resonant frequency based on the presence of metal structures, using coils oriented to cancel out external magnetic field interference, enabling accurate anchoring confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sensors are used to detect support structure attachment, then the device can detect metal structures, but external magnetic fields cause incorrect detection and reliability deteriorates
Solution Approach 1:
The patent converts the harmful effect of external magnetic fields into a useful signal by detecting changes in resonant frequency caused by metal structures. The inductive sensor's resonant frequency shifts when metal is present, and this shift is measured to determine attachment status, turning magnetic field interference into a detection mechanism.
Solution Approach 2:
The patent changes the detection parameter from direct magnetic field sensing to resonant frequency measurement. By monitoring the resonant frequency of the inductive sensor, the system can distinguish between external magnetic fields and metal structures based on the characteristic frequency shifts that occur when metal is attached.
2Measurement precision
If inductive sensors are used to detect metal structures, then detection accuracy improves, but the sensors cannot detect covered metals and external magnetic field interference increases
Solution Approach 1:
The patent uses resonant frequency as the measurement parameter, which changes characteristically when metal structures are detected. This frequency-based measurement allows the system to distinguish metal detection signals from external magnetic field interference, maintaining precision while reducing false positives.
Solution Approach 2:
The patent replaces traditional mechanical or direct contact-based attachment confirmation with an electromagnetic sensing system that measures resonant frequency changes. This substitution enables non-contact detection and provides more precise measurement of attachment status.
3Device complexity
If simple attachment detection methods are used, then device complexity is reduced, but the ability to confirm proper anchoring deteriorates
Solution Approach 1:
The patent replaces complex mechanical attachment confirmation mechanisms with a simpler electromagnetic sensing system. The inductive sensor electronically detects metal presence through resonant frequency changes, eliminating the need for mechanical interlocks or complex mechanical verification systems.
Solution Approach 2:
The inductive sensor performs self-diagnosis by monitoring its own resonant frequency. The sensor circuit automatically detects changes in its electrical characteristics that indicate metal proximity, providing self-verified attachment confirmation without requiring additional complex verification mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides reliable anchoring detection for all metals, including those covered, and reduces interference from external magnetic fields, ensuring worker safety by confirming proper attachment to support structures.
Implementation Method 1
an inductive sensor within the body for sensing whether the support structure is within the area of attachment. The inductive sensor includes an electrical circuit arranged within the body so that a resonant frequency of the electrical circuit of the inductive sensor changes when the support structure is within the area of attachment
Implementation Method 2
using inductive sensing techniques, such as detecting changes to a resonant frequency of electronic circuits of one or more inductive sensors
Implementation Method 3
using coils oriented to cancel out external magnetic field interference
Data Source
AI summary
Techniques are described for monitoring and controlling fall protection equipment. For example, the techniques of this disclosure may be used to monitor the connection status of fall protection equipment, e.g., whether or not the fall protection equipment is connected to a support structure. The techniques described in the disclosure may determine whether the fall protection equipment is connected to a support structure based on changes in a resonant frequency of an electronic circuit of an inductive sensor within the fall protection equipment. The inductive sensor may be formed from sets of one or more coils, where a first set of one or more coils and a second set of one or more coils are wound in opposite directions.